Genetic apparatus

What is the gene?

• a portion of the DNA molecule containing information about the primary structure of the protein

• a portion of the RNA molecule containing information about the primary structure of the protein

• a portion of the protein molecule

• the smallest site of the DNA molecule whose change leads to mutation

Which of the following is not a property of a gene

•   specificity

• allelism

• degeneracy

• discreteness

The specificity of genes is:

• each structural gene has its specific order of arrangement of the nucleotides and determines the synthesis of certain polypeptide

• one gene may be responsible for the manifestation of several signs

• degree of phenotypic manifestation

• the frequency of gene

What is the transduction?

• the transfer of genetic information by DNA molecule

• the transfer of genetic information by the protein molecule

• the transfer of genetic information by amino acids

• the transfer of genetic information by bacteriophage

What is the expressivity?

• each structural gene has its specific order of arrangement of the nucleotides and determines the synthesis of certain polypeptide

• one gene may be responsible for the manifestation of several signs

• degree of phenotypic manifestation

• the frequency of gene

What is the genotype?

•   this is a set of genes which individual receives from its parents

• the set of external and internal signs of the human body

• this is a haploid set of genes in the chromosomes

• this is a tetraploid set of genes in the chromosomes

What is the karyotype?

• the terminal site of chromosome

• a set of diploid chromosomes of a certain type

• a set of haploid chromosomes

• despiralized site of the chromosome at the end of mitosis and in the interphase

What is the exon?

• it is the sites which are non-coding amino acid sequences in a protein

• it is the smallest portion of the DNA molecule,  the change of it leads to mutation

• sense sites that code for amino acid sequences in a protein

• the unit of recombination: the exchange of portions of homologous chromosomes in the prophase of meiosis I

THIS IS ...

• transformation

• mutation

• transduction

• pleiotropy

Who and when discovered the biochemical nature of the transforming factor?

• J.Watson and F.Crick, 1953

• F. Griffith, 1928

• O.Avery,  Macleod, Mccarthy, 1944

• Zinger and Lederberg, 1952